It seems to me a super creative and interesting idea, throwing the stone into the river with what you want to get rid of seems super therapeutic, apart from the fact that the visit to that place is already therapeutic. I understand your word on the stone, my partner suffers from migraines and a friend too and their episodes are quite strong and the most difficult thing to discover is the trigger, sometimes it seems to be anything. but I'm sure these adventures do you a lot of good so don't stop doing it, it's the best therapy 🙃😉😀